'I said that I do not know where lies the vault containing Celebrian's legacy, but it may be that I can help you to gain entrance when it is found.
'The riddle itself may be the key to the vault. If in your travels near Imladris you find a sealed vault, those words may offer you passage within. There should be a rock in front of the entrance. Place your hand on the rock and recite the verse.
'I would be surprised if the jewel is in the vale of Imladris itself as these carefully tended gardens and groves are too often frequented by the Elves for a vault to be easily hidden. I have no doubt it is close by, somewhere in the Trollshaws not far from Imladris.'
Glorfindel does not know where Celebrian's legacy is, but he has given you some advice which may help you to find it.
Glorfindel advised you to place a hand on a rock by the entrance of the Elf-vault and to recite the verses of the riddle. Celebrian's legacy, a white jewel, should be somewhere in the vault. If you find the jewel, return to Glorfindel with your prize.
Bring Celebrian's legacy to Glorfindel
Deliver Celebrian's legacy to Elrond
Glorfindel asked you to bring Celebrian's legacy to Elrond.
The Vault of Celebrian's legacy is at LOC:33.3S, 6.4W. Click on the Rock Pillar to open it.
Vault of Celebrian's legacy has 4 Deadly Stone-crawler's in it one that summons two Writhing Stone-crawler's.
At the end of the vault, is Celebrian's Legacy on a table.
This quest chain involves a character in LotR named, Celebrian.
Celebrian was Elrond Halfelven's wife, the mother of Arwen Undomiel, more familiarly known as Arwen Evenstar.